A valid puzzle is a puzzle with only one solution.
You may enter any values, but it is not easy to create a valid puzzle by yourself.
SuDoKu-knekkeren checks the puzzle if it's valid
before you can play / start the solver.
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You may also turn on the Edit-mode (see picture below), to change a puzzle.
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Picture: Edit-mode (Button New - Original puzzle - Edit)
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Use the Edit-mode only on a valid puzzle.
Be aware of that you may define everything.
If you end the Edit-mode by selecting the menu-item Edit,
SuDoKu-knekkeren doesn't check the puzzle,
which can result in unpredictable results.
Pressing the Complete-button always checks the puzzle.
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